One word of warning about your girlfriend - if you want her to decide she likes hiking you ought to make sure she's got a comfortable pack. Some women wear packs around the hips (I do it this way) and some women wear packs on top of the hips. The difference is a full pack size. For women, measuring torso length and assuming you can use that to determine pack size is a risky business. If you buy from ULA or GG or one of the other small businesses, I encourage you to buy two sizes, have her wear both around the house, and return one of them. If she starts with a pack that doesn't fit, she may not know enough to know that it should be more comfortable than it is.
My 2009 or 2010 ULA Circuit without the optional stuff weighs 35 oz. Extremely durable, comfortable, and functional. Nothing not to love. I've used it for about 35 weeks of hiking. It's more comfortable than my husband's Ohm-2 for weights over ~20 pounds.
I just tried a GG Mariposa for five minutes at last weekend's Gathering of Gear Geeks. Seems very comfortable, the suspension seems effective, and the pockets are functional, although the belt pockets are not as large as the ULA belt pockets. It's a little lighter than the Circuit. As per my sizing comment, Grant from Gossamer Gear was at the gathering, and his personal pack fit me perfectly, even though I'm ~4" shorter than he is; but that same pack was way too big for another women who is my same height.